Instructions For Using Sub-Routine Tests
Sub-routines are the following checks which are performed to correct a service code. Be sure to perform check as instructed. After replacing components or repairing circuits, repeat "Functional Test" and check engine operation.
Observe the following instructions when performing subroutines:
- Do not measure voltage or resistance at MCU module, or connect test lamps to it (unless specific instructions say to do so).
- Disconnect both ends of a circuit when looking for continuity or shorts. Be sure ignition is turned off.
- Disconnect solenoids and switches from harness before measuring resistance or continuity.
- When more than one service code is indicated, start service with the first code received.
- Use wiring diagrams to locate pin locations and connectors.NOTE: Complete system wiring diagrams are located before Sub-Routine Tests. Each test has a partial schematic to aid in servicing.